JP3422284B2 - Prismatic nonaqueous electrolyte secondary battery - Google Patents
Prismatic nonaqueous electrolyte secondary batteryInfo
- Publication number
- JP3422284B2 JP3422284B2 JP12363899A JP12363899A JP3422284B2 JP 3422284 B2 JP3422284 B2 JP 3422284B2 JP 12363899 A JP12363899 A JP 12363899A JP 12363899 A JP12363899 A JP 12363899A JP 3422284 B2 JP3422284 B2 JP 3422284B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode plate
- separator
- positive electrode
- negative electrode
- secondary battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cell Separators (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は角形非水電解液二次
電池に係り、特に正極板及び負極板を積層した極板群を
備えた角形非水電解液二次電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prismatic non-aqueous electrolyte secondary battery, and more particularly to a prismatic non-aqueous electrolyte secondary battery provided with an electrode plate group in which a positive electrode plate and a negative electrode plate are laminated.
【０００２】[0002]
【従来の技術】正極、負極を交互に積層することによっ
て極板群を形成する角形非水電解液二次電池では、正極
及び負極のいずれか一方に袋状のセパレータを配して両
者を隔離している。また一般に、セパレータには、過充
電や短絡などにより電池の温度が上昇したときに、シャ
ットダウンして（孔が塞がって）両極板の電気的接触を
絶つような機能を持たせている。このシャットダウン
は、より低い温度で起こる方が安全性からみて好ましい
が、更に温度が上昇したときに起こるメルトダウン（セ
パレータそのものの溶融）との温度差を設けることが難
しいので、瞬時に高温に達するような場合には安全性を
保つことが困難である。このため、低温でシャットダウ
ンの起こる材料と、シャットダウンは起こりにくいが高
温でもメルトダウンしない材料を重ね合わせた多層膜構
造のセパレータなどが用いられることもある。2. Description of the Related Art In a prismatic non-aqueous electrolyte secondary battery in which a positive electrode and a negative electrode are alternately laminated to form an electrode plate group, a bag-shaped separator is arranged on either the positive electrode or the negative electrode to separate the two. is doing. Further, generally, the separator has a function of shutting down (closing the hole) and disconnecting the electrical contact of the bipolar plates when the temperature of the battery rises due to overcharge or short circuit. It is preferable for this shutdown to occur at a lower temperature from the viewpoint of safety, but it is difficult to establish a temperature difference from the meltdown (melting of the separator itself) that occurs when the temperature further rises, so the temperature reaches an instant. In such cases, it is difficult to maintain safety. Therefore, a separator having a multilayer film structure in which a material that causes a shutdown at a low temperature and a material that does not easily cause a shutdown but does not melt down even at a high temperature are stacked may be used.
【０００３】[0003]
【発明が解決しようとする課題】上述のように、正極及
び負極のいずれか一方に袋状のセパレータを配する場合
には、セパレータが配されない方の極板から活物質の脱
落が起こるので、短絡などの不良の原因になる。また、
安全性を確保するために多層膜構造のセパレータを用い
ると、コスト高になるなどの問題が生じる。更に、袋状
のセパレータでは両側端部が閉じられているので、注液
の際に電解液が回りにくく、極板全体が一様に充放電反
応に使われない、という問題が発生することがある。As described above, when a bag-shaped separator is arranged on either one of the positive electrode and the negative electrode, the active material falls off from the electrode plate on which the separator is not arranged. It may cause a defect such as a short circuit. Also,
If a separator having a multilayer film structure is used to ensure safety, there arises a problem such as an increase in cost. Furthermore, since both ends of the bag-shaped separator are closed, the electrolyte does not easily rotate during injection, and the problem that the entire electrode plate is not uniformly used for charge / discharge reactions may occur. is there.
【０００４】本発明は上述のような問題に鑑みて、活物
質の脱落による短絡がなく、安全性が高く、かつ、設計
容量が確実に実容量に反映される角形非水電解液二次電
池を提供することを目的とする。In view of the above problems, the present invention is a prismatic non-aqueous electrolyte secondary battery in which there is no short circuit due to the dropping of the active material, the safety is high, and the designed capacity is reliably reflected in the actual capacity. The purpose is to provide.
【０００５】[0005]
【課題を解決するための手段】本発明は上記目的を達成
するために、正極板及び負極板を積層した極板群を備
え、前記正極板及び負極板が袋状のそれぞれ異なる特性
を有する２種類のセパレータに収納された角形非水電解
液二次電池であって、前記２種類のセパレータのうち、
シャットダウンが他方に対して低温で起こるセパレータ
に前記正極板及び負極板のいずれか一方が収納され、メ
ルトダウンが一方に対して高温で起こるセパレータに前
記正極板及び負極板のいずれか他方が収納されている。
本発明では、それぞれ異なる特性を有する２種類のセパ
レータのうち、シャットダウンが他方に対して低温で起
こるセパレータに正極板及び負極板のいずれか一方が収
納され、メルトダウンが一方に対して高温で起こるセパ
レータに正極板及び負極板のいずれか他方が収納されて
いるので、過充電等の大きな温度上昇の起こる状況下で
も安全性の高い電池を得ることができると共に、正極板
及び負極板が袋状のセパレータに収納されているので、
極板から活物質が脱落することを防止することができ、
活物質脱落による内部短絡をなくすことができる。In order to achieve the above-mentioned object, the present invention comprises an electrode plate group in which a positive electrode plate and a negative electrode plate are laminated, and the positive electrode plate and the negative electrode plate have different bag-like characteristics.
A prismatic non-aqueous electrolyte secondary battery housed in two types of separators having:
Separator where shutdown occurs at low temperature relative to the other
Either the positive electrode plate or the negative electrode plate is housed in the
Before the ltdown occurs on one side the separator happens at high temperature
Either the positive electrode plate or the negative electrode plate is accommodated.
In the present invention, two types of separators having different characteristics are used.
Shutdown of one of the
Either one of the positive electrode plate and the negative electrode plate fits in this separator.
Separation, where meltdown occurs at high temperature for one side
Either the positive plate or the negative plate is stored in the battery
Therefore, in a situation where a large temperature rise such as overcharge occurs,
It is possible to obtain a highly safe battery, and since the positive electrode plate and the negative electrode plate are housed in a bag- shaped separator,
It is possible to prevent the active material from falling off from the electrode plate,
It is possible to eliminate an internal short circuit due to the loss of the active material.
【０００６】この場合において、例えば、リチウム二次
電池等では正極板側で発熱し蓄積され易いので、早目に
シャットダウンを起こすと共に、メルトダウンを更に遅
らせるためには、正極板はシャットダウンが低温で起こ
るセパレータに収納され、負極板はメルトダウンが高温
で起こるセパレータに収納されることが好ましい。更
に、セパレータの膜厚を１５μｍ〜３０μｍとすれば、
短絡への耐性を充分に保ちながら両極板間の距離を小さ
く保つことができるので、高率放電特性等の電池性能を
低下せしめないようにすることができる。また、セパレ
ータの袋状両側端部の少なくとも一方の側端部に電解液
が浸透可能な未溶着部又は切り欠き部を形成すれば、電
解液の回りが良くなり電解液に浸漬しない部分がなくな
るので、極板全体を確実に充放電反応に使うことがで
き、設計通りの容量を持った電池とすることができる。
そして、セパレータの材料を、ポリプロピレン及びポリ
エチレンから選択される少なくとも１種以上からなるよ
うにすれば、多孔質薄膜を形成することができると共
に、所望のシャットダウン特性及びメルトダウン特性を
得ることができる。[0006] In this case, if example embodiment, because it is easy is to generate heat in the positive electrode plate side storage in a lithium secondary battery or the like, along with causing shutdown early, in order to further slow the meltdown, the positive electrode plate is shutdown cold It is preferable that the negative electrode plate is housed in a separator that causes meltdown at a high temperature. Furthermore, if the thickness of the separator is 15 μm to 30 μm,
Since the distance between the two electrode plates can be kept small while sufficiently maintaining the resistance to short circuit, it is possible to prevent the battery performance such as high rate discharge characteristics from being deteriorated. Further, if at least one side end of the bag-shaped both ends of the separator is formed with an unwelded portion or a cutout portion into which the electrolytic solution can permeate, the circumference of the electrolytic solution is improved and there is no portion that is not immersed in the electrolytic solution. Therefore, the entire electrode plate can be reliably used for the charge / discharge reaction, and the battery having the capacity as designed can be obtained.
When the material of the separator is made of at least one selected from polypropylene and polyethylene, a porous thin film can be formed and desired shutdown characteristics and meltdown characteristics can be obtained.
【０００７】[0007]
【発明の実施の形態】以下、図面を参照して本発明が適
用される角形非水電解液二次電池の実施の形態について
説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a prismatic non-aqueous electrolyte secondary battery to which the present invention is applied will be described below with reference to the drawings.
【０００８】（構成）図１に示すように、本実施形態の
角形非水電解液二次電池は、正極板１及び負極板２を多
数枚積層した極板群を備えている。(Structure) As shown in FIG. 1, the prismatic non-aqueous electrolyte secondary battery of this embodiment is provided with an electrode plate group in which a large number of positive electrode plates 1 and negative electrode plates 2 are laminated.
【０００９】正極板１は、可逆的にリチウム（Ｌｉ）を
放出／吸蔵することができる正極活物質のマンガン酸リ
チウム（ＬｉＭｎ２Ｏ４）粉末と、導電剤の鱗片状黒鉛
と、結着剤のポリフッ化ビニリデンと、を混合し、これ
に分散溶媒のＮ−メチル−２−ピロリドン（ＮＭＰ）を
添加、混練したスラリを、図１に示したように、集電タ
ブが形成されたアルミニウム箔（正極集電体）両面に塗
布することにより作製されている。一方、負極板２は、
半可逆的にＬｉを放出／吸蔵することができる負極活物
質のグラファイトに結着剤のポリフッ化ビニリデンを添
加し、これに分散溶媒のＮＭＰを添加、混練したスラリ
を集電タブが形成された銅箔（負極集電体）両面に塗布
することにより作製されている。The positive electrode plate 1 includes lithium manganate (LiMn 2 O 4 ) powder as a positive electrode active material capable of reversibly releasing / occluding lithium (Li), flake graphite as a conductive agent, and a binder. Of polyvinylidene fluoride, and N-methyl-2-pyrrolidone (NMP) as a dispersion solvent was added to the mixture and kneaded to obtain an aluminum foil on which a current collecting tab was formed, as shown in FIG. (Positive electrode current collector) It is manufactured by applying on both surfaces. On the other hand, the negative electrode plate 2 is
A binder tab, polyvinylidene fluoride, was added to graphite, which is a negative electrode active material capable of semi-reversibly releasing / occluding Li, and NMP, which was a dispersion solvent, was added to this and a kneaded slurry was formed into a current collecting tab. It is produced by applying on both surfaces of a copper foil (negative electrode current collector).
【００１０】正極板１にはＵ字状に２つ折りにして形成
された袋状の正極セパレータ３が被せられている。この
正極セパレータ３は、膜厚２５μｍのポリプロピレン製
で、シャットダウンが低温で起こる（シャットダウン特
性に優れた）セパレータである。また、長手上部方向は
開口されており、この開口部を先端として正極板１が下
部側から被せられている。図２に示すように、正極セパ
レータ３の袋状両側端部には、側端部を構成する２枚の
ポリプロピレン薄膜同士を部分的に溶着した溶着部５と
未溶着の未溶着部６とが形成されており、この未溶着部
６から電解液が正極セパレータ３内に浸透することが許
容されている。一方、負極板２も正極板１と同様に、袋
状の負極セパレータ４が被せられている。負極セパレー
タ４は膜厚が２５μｍであり正極セパレータ３より融点
の高い（メルトダウン特性に優れた）ポリエチレン製と
されており、負極セパレータ４の袋状両側端部にはポリ
エチレン薄膜同士が部分的に溶着された溶着部５と未溶
着の未溶着部６とが形成されている。The positive electrode plate 1 is covered with a bag-shaped positive electrode separator 3 formed by folding it in a U shape. The positive electrode separator 3 is made of polypropylene and has a film thickness of 25 μm, and is a separator in which shutdown occurs at a low temperature (excellent shutdown characteristics). Also, an opening is formed in the upper direction in the longitudinal direction, and the positive electrode plate 1 is covered from the lower side with this opening as a tip. As shown in FIG. 2, on both side ends of the positive electrode separator 3 in a bag shape, there are a welded part 5 in which two polypropylene thin films forming side ends are partially welded and an unwelded unwelded part 6. It is formed, and the electrolytic solution is allowed to permeate into the positive electrode separator 3 through the unwelded portion 6. On the other hand, like the positive electrode plate 1, the negative electrode plate 2 is covered with a bag-shaped negative electrode separator 4. The negative electrode separator 4 is made of polyethylene having a film thickness of 25 μm and having a higher melting point than the positive electrode separator 3 (excellent in meltdown characteristics), and polyethylene thin films are partially formed on both side ends of the negative electrode separator 4 in a bag shape. A welded portion 5 that has been welded and an unwelded portion 6 that has not been welded are formed.
【００１１】上述した極板群は、正極セパレータ３に収
納された正極板１が８４枚、負極セパレータ４に収納さ
れた負極板２が８５枚、それぞれ交互に積層されて構成
されている。それぞれ正極板１及び負極板２の集電タブ
は図示しない正極ストラップ及び負極ストラップに超音
波溶接されている。極板群はステンレス製で角形の図示
しない電池缶に挿入された後、電池缶の開口部はステン
レス製の図示しない電池蓋でレーザー溶接により封口さ
れている。電池蓋には図示しない注液口が形成されてお
り、この注液口から電解液を所定量電池缶内に注入後、
レーザー溶接又は電子ビーム溶接により注液口は封止さ
れている。なお、本実施形態では、１モル／リットルの
６フッ化リン酸リチウム（ＬｉＰＦ６）を含むエチレン
カーボネート（ＥＣ）とジメチルカーボネート（ＤＭ
Ｃ）の有機混合液等の高電位差による分解の起こりにく
い電解液が注入されており、角形非水電解液二次電池の
電気容量は６６Ａｈである。The above-mentioned electrode plate group is constructed by alternately stacking 84 positive electrode plates 1 housed in the positive electrode separator 3 and 85 negative electrode plates 2 housed in the negative electrode separator 4. The current collecting tabs of the positive electrode plate 1 and the negative electrode plate 2, respectively, are ultrasonically welded to a positive electrode strap and a negative electrode strap (not shown). The electrode plate group is made of stainless steel and is inserted into a rectangular battery can (not shown), and the opening of the battery can is closed by laser welding with a battery cover (not shown) made of stainless steel. A liquid injection port (not shown) is formed on the battery lid, and after injecting a predetermined amount of electrolytic solution into the battery can from this liquid injection port,
The liquid injection port is sealed by laser welding or electron beam welding. In the present embodiment, ethylene carbonate (EC) and dimethyl carbonate (DM) containing 1 mol / liter of lithium hexafluorophosphate (LiPF 6 ).
An electrolytic solution such as the organic mixed solution of C) which is less likely to be decomposed due to a high potential difference is injected, and the electric capacity of the prismatic nonaqueous electrolytic solution secondary battery is 66 Ah.
【００１２】（試験）次に、本実施形態の角形非水電解
液二次電池及び正極板のみに厚さ４０μｍの袋状セパレ
ータを被せたほぼ同容量の角形非水電解液二次電池を比
較例として作製し、これらの電池について過充電安全性
試験及び放電容量試験を行った。なお、放電容量試験で
は、１／８Ｃから１時間率までの電流値でのそれぞれの
放電容量を測定した。(Test) Next, a comparison was made between the prismatic non-aqueous electrolyte secondary battery of the present embodiment and a prismatic non-aqueous electrolyte secondary battery having a bag-shaped separator having a thickness of 40 μm only on the positive electrode plate. Produced as an example, these batteries were subjected to an overcharge safety test and a discharge capacity test. In the discharge capacity test, respective discharge capacities at current values from 1 / 8C to 1 hour rate were measured.
【００１３】[試験結果] 過充電安全性試験及び放電容
量試験の試験結果をそれぞれ図３及び図４に示す。[Test Results] The test results of the overcharge safety test and the discharge capacity test are shown in FIGS. 3 and 4, respectively.
【００１４】[評価] 過充電安全性試験の結果、図３
（Ａ）に示すように、比較例の電池ではＳＯＣ（充電状
態）２３０％付近で電池電圧の急激な上昇が発生しシャ
ットダウンが起こり、続いて直後に温度の急激な上昇が
発生しメルトダウンが起こって発火に至った。一方、本
実施形態の電池では、図３（Ｂ）に示すように、ＳＯＣ
２３０％付近で同様にシャットダウンが起きているもの
の、その後にメルトダウンは起こらず、発火を生じない
安全な挙動を示した。また、放電容量試験の結果、図４
に示すように、本実施形態の電池は比較例の電池とほぼ
同等の高率放電特性を示した。[Evaluation] As a result of the overcharge safety test, FIG.
As shown in (A), in the battery of the comparative example, abrupt increase of the battery voltage occurred at about 230% SOC (state of charge) and shutdown occurred, and immediately thereafter, a rapid increase of temperature occurred and meltdown occurred. It happened and led to a fire. On the other hand, in the battery of this embodiment, as shown in FIG.
Although the shutdown similarly occurred around 230%, the meltdown did not occur thereafter and the behavior was safe without ignition. In addition, as a result of the discharge capacity test, FIG.
As shown in, the battery of this embodiment exhibited high rate discharge characteristics almost equivalent to the battery of the comparative example.
【００１５】（作用等）本実施形態の角形非水電解液二
次電池では、正極板１及び負極板２がそれぞれ袋状の正
極セパレータ３及び負極セパレータ４に収納され交互に
積層されており、また、電解液により正極及び負極集電
体に塗布された活物質が膨潤してセパレータ３、４間に
押圧が生ずるので、活物質が集電体から脱落することを
防止することができる。また、正極板１及び負極板２は
袋状のセパレータに収納されているので、両極板の表面
や端部に残った活物質の清浄工程を省いても、該活物質
残留物による内部短絡など電池の損傷を防止することが
できる。(Operation, etc.) In the prismatic non-aqueous electrolyte secondary battery of this embodiment, the positive electrode plate 1 and the negative electrode plate 2 are housed in the bag-shaped positive electrode separator 3 and negative electrode separator 4, respectively, and are alternately laminated. In addition, since the active material applied to the positive electrode and the negative electrode current collector swells by the electrolytic solution and a pressure is generated between the separators 3 and 4, it is possible to prevent the active material from falling off the current collector. Further, since the positive electrode plate 1 and the negative electrode plate 2 are housed in the bag-shaped separator, even if the step of cleaning the active material left on the surface or the end of the both electrode plates is omitted, an internal short circuit due to the active material residue, etc. It is possible to prevent damage to the battery.
【００１６】また、正極板１を低温でシャットダウンが
起こる正極セパレータ３に収納し、負極板２を高温でメ
ルトダウンが起こる負極セパレータ４に収納したので、
過充電時にも比較的過充電容量の低い段階でシャットダ
ウンが起こり、かつ、過充電量が増加して電池が高温と
なっても、過充電安全性試験結果でも示したように、セ
パレータの溶融による内部短絡を起こすことのない安全
な角形非水電解液二次電池を得ることができる。Further, since the positive electrode plate 1 is housed in the positive electrode separator 3 which is shut down at low temperature and the negative electrode plate 2 is housed in the negative electrode separator 4 which is melted down at high temperature,
Even when overcharged, shutdown occurs at a stage where the overcharge capacity is relatively low, and even if the overcharge amount increases and the battery becomes hot, as shown in the overcharge safety test results, due to melting of the separator, It is possible to obtain a safe prismatic non-aqueous electrolyte secondary battery that does not cause an internal short circuit.
【００１７】更に、セパレータは、膜厚が１５μｍ未満
では耐性が充分でなく破断したときに内部短絡を招き、
膜厚が３０μｍを越えると極板間の距離が大きくなり高
率放電特性等電池の性能が低下する。本実施形態では、
１５μｍ〜３０μｍの範囲にある２５μｍとしたので、
内部短絡を招くことなく、また、正極、負極両側に膜厚
の薄いセパレータを用いることで、放電容量試験結果で
も示したように、従来の（比較例の）一方のみにセパレ
ータを用いた電池ともほぼ変わらない高率放電特性を得
ることができる。Further, the separator has insufficient resistance when the film thickness is less than 15 μm and causes an internal short circuit when it breaks,
When the film thickness exceeds 30 μm, the distance between the electrode plates becomes large and the battery performance such as high rate discharge characteristics deteriorates. In this embodiment,
Since it is set to 25 μm in the range of 15 μm to 30 μm,
By using thin separators on both sides of the positive electrode and the negative electrode without inducing an internal short circuit, as shown in the discharge capacity test results, it is possible to use a conventional battery (comparative example) having a separator only on one side. It is possible to obtain high rate discharge characteristics that are almost unchanged.
【００１８】また、本実施形態では、正極セパレータ
３、負極セパレータ４の両側端部に電解液が浸透可能な
未溶着部６を形成したので、正極板１及び負極板２の表
面の活物質に電解液が行き渡り、確実に設計通りの容量
を持った角形非水電解液二次電池とすることができる。
更に、未溶着部６の面積が小さいので、セパレータ３の
シャットダウン特性に大きな影響を与えることもない。
そして、正極板１側にシャットダウン特性に優れた正極
セパレータ３を配したので、負極板２をシャットダウン
特性に優れたセパレータに収納するよりシャットダウン
の効果を高めることができる。Further, in this embodiment, since the unwelded portions 6 into which the electrolytic solution can penetrate are formed at both end portions of the positive electrode separator 3 and the negative electrode separator 4, the active material on the surface of the positive electrode plate 1 and the negative electrode plate 2 is formed. It is possible to obtain a prismatic non-aqueous electrolyte secondary battery that has the capacity as designed and surely spreads the electrolyte solution.
Furthermore, since the area of the unwelded portion 6 is small, the shutdown characteristics of the separator 3 are not significantly affected.
Since the positive electrode separator 3 having excellent shutdown characteristics is arranged on the positive electrode plate 1 side, the effect of shutdown can be enhanced as compared with housing the negative electrode plate 2 in the separator having excellent shutdown characteristics.
【００１９】なお、本実施形態では、正極セパレータ
３、負極セパレータ４の両側端部に電解液が浸透可能な
未溶着部６を形成したが、正極集電体及び負極集電体の
表面の活物質に電解液が行き渡ればよいので、未溶着部
６はセパレータ３、４の片側端部に形成するようにして
もよく、また、未溶着部６に代えて溶着後切り欠きを形
成するようにしてもよい。In this embodiment, the unwelded portions 6 into which the electrolytic solution can permeate are formed at both end portions of the positive electrode separator 3 and the negative electrode separator 4, but the active surfaces of the positive electrode current collector and the negative electrode current collector are not formed. Since it is sufficient that the electrolyte is spread over the substance, the unwelded portion 6 may be formed at one end of the separators 3 and 4, or the notch after welding may be formed instead of the unwelded portion 6. You may
【００２０】また、本実施形態では、例えば、角形電池
缶の材質をステンレス製とした例について説明したがア
ルミニウム製としてもよく、また、例示した材質、製造
方法、電解液等についても本発明を制限するものでな
い。そして、本発明は上記特許請求の範囲において種々
の変形が可能であることもいうまでもない。Further, in the present embodiment, for example, the example in which the material of the prismatic battery can is made of stainless steel has been described, but it may be made of aluminum, and the illustrated material, manufacturing method, electrolytic solution and the like are also included in the present invention. There is no limit. And it goes without saying that the present invention can be modified in various ways within the scope of the above claims.
【００２１】[0021]
【発明の効果】以上説明したように、本発明によれば、
それぞれ異なる特性を有する２種類のセパレータのう
ち、シャットダウンが他方に対して低温で起こるセパレ
ータに正極板及び負極板のいずれか一方が収納され、メ
ルトダウンが一方に対して高温で起こるセパレータに正
極板及び負極板のいずれか他方が収納されているので、
過充電等の大きな温度上昇の起こる状況下でも安全性の
高い電池を得ることができると共に、正極板及び負極板
を袋状のセパレータに収納したので、極板からの活物質
の脱落を防止でき、活物質脱落による内部短絡をなくす
ことができる、という効果を得ることができる。As described above, according to the present invention,
Two types of separators with different characteristics
The shutdown occurs at a low temperature with respect to the other.
Either the positive electrode plate or the negative electrode plate is stored in the data
The rectification is correct for the separator that occurs at high temperature for one side.
Since either the electrode plate or the negative electrode plate is stored,
It is safe even under the condition that a large temperature rise such as overcharge occurs.
A high battery can be obtained, and a positive electrode plate and a negative electrode plate
Since it is housed in the bag- shaped separator, it is possible to prevent the active material from falling off from the electrode plate and eliminate the internal short circuit due to the active material falling off.
【図１】本発明が適用される実施形態の角形非水電解液
二次電池のセパレータの形状を示す外観斜視図である。FIG. 1 is an external perspective view showing the shape of a separator of a prismatic non-aqueous electrolyte secondary battery according to an embodiment of the present invention.
【図２】実施形態の角形非水電解液二次電池のセパレー
タの側端部を示す外観斜視図である。FIG. 2 is an external perspective view showing a side end portion of a separator of a prismatic non-aqueous electrolyte secondary battery according to an embodiment.
【図３】過充電安全性試験の結果を横軸に充電状態、縦
軸に電圧、電流及び温度をとって示した図であり、
（Ａ）は比較例の電池の試験結果、（Ｂ）は実施形態の
電池の試験結果を示す。FIG. 3 is a diagram showing the results of an overcharge safety test, in which the horizontal axis represents the state of charge and the vertical axis represents voltage, current and temperature.
(A) shows the test result of the battery of a comparative example, (B) shows the test result of the battery of the embodiment.
【図４】放電容量試験の結果を横軸に放電レート、縦軸
に放電容量比をとって示した図である。FIG. 4 is a diagram showing the results of a discharge capacity test with the horizontal axis representing the discharge rate and the vertical axis representing the discharge capacity ratio.
１ 正極板 ２ 負極板 ３ 正極セパレータ ４ 負極セパレータ ５ 溶着部 ６ 未溶着部 1 Positive plate 2 Negative electrode plate 3 Positive electrode separator 4 Negative electrode separator 5 Welded part 6 Unwelded part
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 2/18 H01M 4/02 H01M 10/40 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) H01M 2/18 H01M 4/02 H01M 10/40
Claims (5)
え、前記正極板及び負極板が袋状のそれぞれ異なる特性
を有する２種類のセパレータに収納された角形非水電解
液二次電池であって、前記２種類のセパレータのうち、
シャットダウンが他方に対して低温で起こるセパレータ
に前記正極板及び負極板のいずれか一方が収納され、メ
ルトダウンが一方に対して高温で起こるセパレータに前
記正極板及び負極板のいずれか他方が収納されたことを
特徴とする角形非水電解液二次電池。1. An electrode plate group in which a positive electrode plate and a negative electrode plate are laminated
The positive electrode plate and the negative electrode plate have different bag-like characteristics.
Nonaqueous electrolysis stored in two types of separators with
A liquid secondary battery, wherein among the two types of separators,
Either one of the positive electrode plate and the negative electrode plate is housed in a separator where shutdown occurs at low temperature, and the other of the positive electrode plate and negative electrode plate is housed in a separator where meltdown occurs at high temperature for one. square-shaped non-aqueous electrolyte secondary battery characterized in that the.
で起こるセパレータに収納され、前記負極板は前記メル
トダウンが高温で起こるセパレータに収納されたことを
特徴とする請求項１に記載の角形非水電解液二次電池。Wherein said positive electrode plate is accommodated in a separator where the shutdown occurs at a low temperature, the negative electrode plate prismatic nonaqueous according to claim 1, wherein the meltdown is housed in the separator occurs at high temperatures Electrolyte secondary battery.
０μｍであることを特徴とする請求項１又は請求項２に
記載の角形非水電解液二次電池。3. The separator has a thickness of 15 μm to 3 μm.
The prismatic nonaqueous electrolyte secondary battery according to claim 1 or 2, wherein the prismatic nonaqueous electrolyte secondary battery is 0 μm.
とも一方の側端部に電解液が浸透可能な未溶着部又は切
り欠き部が形成されたことを特徴とする請求項１乃至請
求項３のいずれか１項に記載の角形非水電解液二次電
池。4. The method of claim 1 to claim 3, characterized in that the bag-shaped both end portions of at least one side edge unwelded portion electrolyte is permeable to portions of the separator or cutout portion is formed The prismatic non-aqueous electrolyte secondary battery according to any one of 1.
ン及びポリエチレンから選択される少なくとも１種以上
からなることを特徴とする請求項１乃至請求項４のいず
れか１項に記載の角形非水電解液二次電池。Material wherein said separator claims 1 to prismatic nonaqueous electrolyte solution according to any one of claims 4 two, characterized in that it consists of at least one selected from polypropylene and polyethylene Next battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12363899A JP3422284B2 (en) | 1999-04-30 | 1999-04-30 | Prismatic nonaqueous electrolyte secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12363899A JP3422284B2 (en) | 1999-04-30 | 1999-04-30 | Prismatic nonaqueous electrolyte secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000315489A JP2000315489A (en) | 2000-11-14 |
| JP3422284B2 true JP3422284B2 (en) | 2003-06-30 |
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| JP12363899A Expired - Fee Related JP3422284B2 (en) | 1999-04-30 | 1999-04-30 | Prismatic nonaqueous electrolyte secondary battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4124972B2 (en) | 2001-02-23 | 2008-07-23 | Ｎｅｃトーキン株式会社 | Stacked lithium-ion battery |
| JP4422166B2 (en) * | 2007-03-29 | 2010-02-24 | シャープ株式会社 | Nonaqueous electrolyte secondary battery and manufacturing method thereof |
| JP4470124B2 (en) | 2008-06-13 | 2010-06-02 | トヨタ自動車株式会社 | battery |
| JP2010212213A (en) * | 2009-03-12 | 2010-09-24 | Nissan Motor Co Ltd | Electrode for secondary battery |
| KR101421847B1 (en) | 2009-09-10 | 2014-07-22 | 닛본 덴끼 가부시끼가이샤 | Stacked battery and method for manufacturing same |
| KR101404704B1 (en) * | 2011-09-19 | 2014-06-09 | 주식회사 엘지화학 | Secondary Battery Having Volume Expandable Material |
| KR101387617B1 (en) * | 2012-09-11 | 2014-04-24 | 주식회사 루트제이드 | Separator for electrode assembly of secondary battery and secondary battery having the same |
| CN102945939A (en) * | 2012-11-16 | 2013-02-27 | 深圳市雄韬电源科技股份有限公司 | Absorbent glass mineral wool (AGM) bag-type separation plate wrapper sheet structure and production method |
| JP6325196B2 (en) * | 2013-03-27 | 2018-05-16 | 日本電気株式会社 | Fusion bonding structure of resin film and method of forming fusion bonding structure of resin film |
| JP6163847B2 (en) * | 2013-04-17 | 2017-07-19 | 三菱自動車工業株式会社 | Secondary battery |
| TWI811937B (en) | 2013-10-22 | 2023-08-11 | 日商半導體能源研究所股份有限公司 | Secondary battery and electronic device |
| US20150138699A1 (en) | 2013-11-15 | 2015-05-21 | Semiconductor Energy Laboratory Co., Ltd. | Electronic device |
| US20150140400A1 (en) * | 2013-11-15 | 2015-05-21 | Semiconductor Energy Laboratory Co., Ltd. | Power storage unit and electronic device including the same |
| US10158108B2 (en) * | 2014-10-24 | 2018-12-18 | Semiconductor Energy Laboratory Co., Ltd. | Power storage device including separator surrounding electrode |
| WO2017027037A1 (en) * | 2015-08-13 | 2017-02-16 | Daramic, Llc | Improved separators for flat plate batteries |
| JP7408287B2 (en) | 2019-03-15 | 2024-01-05 | 株式会社東芝 | Batteries, battery packs, vehicles and stationary power supplies |
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